DAC02 - Troubleshooting - Why low volume?

2. AUX ports do NOT support professional/high impedance headphones/speakers such as Audio-Technica, Ultrasone, Sennheiser or others with impedance over 32Ω.

3. This DAC is a digital to analog converter only, can't be an audio amplifier. If you are using the suggested connection and the impedance of your headset/speaker is under 32Ω, we suggest you to connect a amplifier to produce sufficient volume.